Horseman advancing right, brandishing a sable / Inscription in three lines "KNYAZ/VELIKI/IVAN/PCIC" ("Grand Duke Ivan, PCIC"). 13.5mm, 0.65 grams. Garost #1; Russian Wire Coins #73.

This is a full kopeck (not a denga), weighing 0.65 grams. The coin was minted in Moscow in 1535-1538 when Ivan was still just a Grand Duke and not a Tsar.